Revert "[buffermgr] Support maximum port headroom checking (sonic-net#1607)" (sonic-net#1675)

This reverts commit 189a964.

Author: prsunny

cfgmgr/buffer_check_headroom_mellanox.lua

@@ -10,15 +10,36 @@ local new_pg = ARGV[3]
 local accumulative_size = 0
 
 local appl_db = "0"
+local config_db = "4"
 local state_db = "6"
 
 local ret_true = {}
+local ret_false = {}
 local ret = {}
 local default_ret = {}
 
 table.insert(ret_true, "result:true")
+table.insert(ret_false, "result:false")
 
-default_ret = ret_true
+-- Fetch the cable length from CONFIG_DB
+redis.call('SELECT', config_db)
+local cable_length_keys = redis.call('KEYS', 'CABLE_LENGTH*')
+if #cable_length_keys == 0 then
+    return ret_true
+end
+
+-- Check whether cable length exceeds 300m (maximum value in the non-dynamic-buffer solution)
+local cable_length_str = redis.call('HGET', cable_length_keys[1], port)
+if cable_length_str == nil then
+    return ret_true
+end
+local cable_length = tonumber(string.sub(cable_length_str, 1, -2))
+if cable_length > 300 then
+    default_ret = ret_false
+else
+    default_ret = ret_true
+end
+table.insert(default_ret, 'debug:no max_headroom_size configured, check cable length instead')
 
 local speed = redis.call('HGET', 'PORT|' .. port, 'speed')
 
@@ -46,6 +67,7 @@ local function get_number_of_pgs(keyname)
     local range = string.match(keyname, "Ethernet%d+:([^%s]+)$")
     local size
     if range == nil then
+        table.insert(debuginfo, "debug:invalid pg:" .. keyname)
         return 0
     end
     if string.len(range) == 1 then
@@ -97,9 +119,11 @@ if max_headroom_size > accumulative_size then
     table.insert(ret, "result:true")
 else
     table.insert(ret, "result:false")
-    table.insert(ret, "debug:Accumulative headroom on port " .. accumulative_size .. " exceeds the maximum available headroom which is " .. max_headroom_size)
 end
 
+table.insert(ret, "debug:max headroom:" .. max_headroom_size)
+table.insert(ret, "debug:accumulative headroom:" .. accumulative_size)
+
 for i = 1, #debuginfo do
     table.insert(ret, debuginfo[i])
 end

orchagent/port.h

@@ -124,7 +124,6 @@ class Port
     uint32_t  m_vnid = VNID_NONE;
     uint32_t  m_fdb_count = 0;
     uint32_t  m_up_member_count = 0;
-    uint32_t  m_maximum_headroom = 0;
 
     /*
      * Following two bit vectors are used to lock

orchagent/portsorch.cpp

@@ -263,9 +263,6 @@ PortsOrch::PortsOrch(DBConnector *db, vector<table_name_with_pri_t> &tableNames)
     m_flexCounterTable = unique_ptr<ProducerTable>(new ProducerTable(m_flex_db.get(), FLEX_COUNTER_TABLE));
     m_flexCounterGroupTable = unique_ptr<ProducerTable>(new ProducerTable(m_flex_db.get(), FLEX_COUNTER_GROUP_TABLE));
 
-    m_state_db = shared_ptr<DBConnector>(new DBConnector("STATE_DB", 0));
-    m_stateBufferMaximumValueTable = unique_ptr<Table>(new Table(m_state_db.get(), STATE_BUFFER_MAXIMUM_VALUE_TABLE));
-
     initGearbox();
 
     string queueWmSha, pgWmSha;
@@ -3325,25 +3322,6 @@ void PortsOrch::initializePriorityGroups(Port &port)
     SWSS_LOG_INFO("Get priority groups for port %s", port.m_alias.c_str());
 }
 
-void PortsOrch::initializePortMaximumHeadroom(Port &port)
-{
-    sai_attribute_t attr;
-
-    attr.id = SAI_PORT_ATTR_QOS_MAXIMUM_HEADROOM_SIZE;
-
-    sai_status_t status = sai_port_api->get_port_attribute(port.m_port_id, 1, &attr);
-    if (status != SAI_STATUS_SUCCESS)
-    {
-        SWSS_LOG_NOTICE("Unable to get the maximum headroom for port %s rv:%d, ignored", port.m_alias.c_str(), status);
-        return;
-    }
-
-    vector<FieldValueTuple> fvVector;
-    port.m_maximum_headroom = attr.value.u32;
-    fvVector.emplace_back("max_headroom_size", to_string(port.m_maximum_headroom));
-    m_stateBufferMaximumValueTable->set(port.m_alias, fvVector);
-}
-
 bool PortsOrch::initializePort(Port &port)
 {
     SWSS_LOG_ENTER();
@@ -3352,7 +3330,6 @@ bool PortsOrch::initializePort(Port &port)
 
     initializePriorityGroups(port);
     initializeQueues(port);
-    initializePortMaximumHeadroom(port);
 
     /* Create host interface */
     if (!addHostIntfs(port, port.m_alias, port.m_hif_id))

orchagent/portsorch.h

@@ -155,7 +155,6 @@ class PortsOrch : public Orch, public Subject
     unique_ptr<Table> m_pgTable;
     unique_ptr<Table> m_pgPortTable;
     unique_ptr<Table> m_pgIndexTable;
-    unique_ptr<Table> m_stateBufferMaximumValueTable;
     unique_ptr<ProducerTable> m_flexCounterTable;
     unique_ptr<ProducerTable> m_flexCounterGroupTable;
 
@@ -166,7 +165,6 @@ class PortsOrch : public Orch, public Subject
 
     shared_ptr<DBConnector> m_counter_db;
     shared_ptr<DBConnector> m_flex_db;
-    shared_ptr<DBConnector> m_state_db;
 
     FlexCounterManager port_stat_manager;
     FlexCounterManager port_buffer_drop_stat_manager;
@@ -229,7 +227,6 @@ class PortsOrch : public Orch, public Subject
 
     bool initializePort(Port &port);
     void initializePriorityGroups(Port &port);
-    void initializePortMaximumHeadroom(Port &port);
     void initializeQueues(Port &port);
 
     bool addHostIntfs(Port &port, string alias, sai_object_id_t &host_intfs_id);